Jamie found a story of NASAs Giant "Science" Roller Coaster. It will be used as an escape chute on rocket launchpads, and will be the 3rd highest drop in the world. More like the Cedar Point Demon Drop than a roller coaster, but still, I'd ride it.
The most exciting phrase to hear in science, the one that heralds new discoveries, is not "Eureka!" (I found it!) but "That's funny ..." -- Isaac Asimov